Every ZIP code in the United States, with weather, radar, trivia and the numbers behind it. Five digits since 1963!

ZIP stands for Zone Improvement Plan. The codes went live on July 1, 1963.The lowest ZIP code is 00501 — the IRS in Holtsville, New York.The highest ZIP code is 99950, in Ketchikan, Alaska.Type 07734 into a calculator and turn it upside down: hELLO. It is Keansburg, New Jersey.12345 belongs to one company: General Electric in Schenectady, New York.The first digit is a region: 0 is New England and New Jersey, 9 is the West Coast, Alaska and Hawaii.Mr. ZIP, the cartoon mailman, was the mascot that sold the idea to America.ZIP+4 arrived in 1983 and can narrow a ZIP down to one side of one block.A ZIP code is a mail route, not a place: plenty of them cross county and even state lines.Play ZIP Hunt: guess the secret ZIP code of the day in six tries.
zipcodes.pro — ZIP/20610

20610

ZIP 20610 is Barstow, Maryland, in Calvert County; area codes 443, 410 and 667; Eastern time.

Type
No street area
Time zone
America/New_York
County
Calvert
Metro area
Lexington Park, MD
Coordinates
38.5254, -76.6161

The Census map gives this ZIP code no delivery area of its own, which usually means it serves post office boxes, a single organization or a post office rather than streets of homes.

This ZIP code has no Census tabulation area of its own. Its point falls inside ZCTA 20678, whose figures describe that area — not this ZIP code.

☼ Live from 20610 — Barstow, MD

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Local time: —

Where 20610 is

This ZIP code has no Census tabulation area, so there is no boundary to draw — the marker is its published point location.

★ Weird and wonderful facts about 20610
  • 🔢 Type 20610 into a pocket calculator and turn it upside down: OIgOZ — not quite a word, sorry.
  • ➕ As a number, 20,610 = 2 × 3 × 3 × 5 × 229. Its digits add up to 9, a total 375 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 101000010000010
  • 🏠 Its numerical neighbours: 20609 (Avenue, MD, 18 mi away) and 20611 (Bel Alton, MD, 21 mi away).
  • 🔄 Backwards, 20610 becomes 01602 — and that is a real ZIP code: Worcester, MA, 360 miles away.
  • 👥 30 other ZIP codes are made of exactly the same digits (00612, 01026, 01062, 01260, 01602, 02061, …). The farthest-flung twin is 00612 in Arecibo, PR, 1,512 miles away.
  • 🧭 Farther south than 55% of all ZIP codes, and farther east than 83%.
  • 🎯1,177 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 20610 and you would come out at 38.53°S, 103.38°E — 837 miles from Perth, Australia, the nearest big city to that spot.
  • ☀Longest day of the year: 14h 51m of daylight. Shortest: 9h 28m.
🌙 The sky over 20610 today
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🌋 Shake report
  • Checking the USGS…

Source: USGS.

Business and tax activity

Business establishments3This ZIP3
Employees13This ZIP13
Annual payroll$995,000This ZIP$995,000

Land area

ZIP codes near 20610

ZIPCityDistance
20678 Prince Frederick, MD 1.1 mi
20612 Benedict, MD 3.6 mi
20676 Port Republic, MD 4.6 mi
20639 Huntingtown, MD 5.3 mi
20608 Aquasco, MD 6.0 mi
20637 Hughesville, MD 7.6 mi
20685 Saint Leonard, MD 7.9 mi
20615 Broomes Island, MD 8.7 mi
20732 Chesapeake Beach, MD 9.8 mi
20689 Sunderland, MD 10.1 mi

Find every ZIP code within 10 miles of 20610 →

Questions about this ZIP code

Where is ZIP code 20610?

20610 is in Barstow, Maryland, in Calvert County, part of the Lexington Park, MD metropolitan area. Its published point location is 38.5254, -76.6161.

What county is 20610 in?

20610 lies in Calvert County.

What area code is 20610?

Barstow uses area codes 443, 410 and 667, from NANPA's telephone records.

What time zone is 20610 in?

20610 uses America/New_York.

What ZIP codes are near 20610?

The closest are 20678 (1.1 mi), 20612 (3.6 mi), 20676 (4.6 mi), 20639 (5.3 mi) and 20608 (6 mi).

Is 20610 a PO Box ZIP code?

Possibly. The Census map gives this ZIP code no delivery area of its own, which usually means it serves post office boxes, a single organization or a post office rather than streets of homes.

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Cite this page

zipcodes.pro. “20610 ZIP Code — Barstow, Maryland (Calvert County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/20610

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curl https://zipcodes.pro/zip/20610.json

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